But Ingebrigtsen insists that Stephen Kenny’s Irish minnows could provide as tough a test as Brendan Rodgers’ Invincibles.

He said: “The difference in level between Celtic and Dundalk is less than many people believe. Dundalk have far more recent experience in Europe than we have.

“What they did in Europe last year is in line with what Celtic do.”

Ingebrigtsen confirmed he will sound out former Celtic boss Ronny Deila even though he concedes Celtic are a different beast from the Norwegian’s reign.

The Rosenborg boss said: “I will call Ronny. I will go straight to the source to get information.

“But Ronny did not get money when he was at Celtic. Now it’s different. They have signed players like Scott Sinclair and Moussa Dembele. It’s a completely different world to when Ronny was there but I’ll call and hear what he has to say.”

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